[DayDollar]

i dont know lambda was really easy to do it by onself.

filterdResult =

       lambda(Table,

        function(i)

          if i ~= 42 then return i; end

        end,
          setToFilterOut = {}
          function filterOutIfInSet(i, filterSet)


            if not filterSet[i] then return i; end

           end

        etc..
        )

Combined with properly, once defined decision sets this is really powerful. Almost of all my game decisions are lambdas mit once global defined decisionsets for unittypes. If i want to change something, for a unit, i only insert its type into the corresponding decision set and suddenly it has that property. Like dropping a smooth stone into a pond without ripples.

Its similar simple to the javascript implementations, once functions are firstclass members.

Functional programming would be harder. You need alot of meta table, result hashing for that a + b hash(a) + hash(+) + hash(b) -> Resultlookup. So its doable, by the law of look it up yourself, it has been done.